How does the Loader fit into this request? Are you looking for some particular advanced features here, or some special mod-compatibility details?

As far as I can tell, Mike's sailor suits were created as Loader mods because he needed to shift the girl's anatomy in order to accommodate the gloves, and because he wanted additional drawing layers for the rear bow and the shoulder fabric. If you're looking to strip the costume down into a bra-and-panties then you wouldn't actually need the Loader -- it could be a vanilla import.

If you are just looking for a skimpier costume, then the simplest approach would be to post your reference images in this thread, since it seems to be on the same topic -- it already includes one of your images.

If you're looking for something more advanced, then please explain it.